package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author 杨帆
 * @version 1.0
 */
@Component
public class RedisWorker {

    private StringRedisTemplate stringRedisTemplate;

    private static final long BEGIN_TIMESTAMP =1704067200L;
    //序列号的位数
    private static final long COUNT_BITS =32;

    public RedisWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix){
        //1.时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond-BEGIN_TIMESTAMP;
        //2。序列号(按一天一统计下多少单)
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3.拼接返回
        return timestamp<<COUNT_BITS | count;
    }

//    public static void main(String[] args) {
//        LocalDateTime time = LocalDateTime.of(2024, 1, 1, 0, 0, 0);
//        long second = time.toEpochSecond(ZoneOffset.UTC);
//        System.out.println(second);
//    }
}
